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TPS92691: Driving LED chip with 75W of output power

Brian Antheunisse
Expert 5305 points
Part Number: TPS92691

Hi guys,

I have an LED chip that has a forward voltage of 34V-ish, and I am looking to drive it at about 1.5A-2A.

The input would be a 12V-18V battery, so I am looking to have this in a boost topology. All of the EVMs and ref designs seem only capable of about ~25W-35W. From what I understand, as long as I side my diode, FET, L and C's appropriately, I shouldn't have a problem with this, right? Just wanted to make sure I wasn't missing any detail that may prohibit this use case.

Thanks!

Brian

  • 0
    TI__Mastermind 25500 points

    Hi Brian,

    You are correct. As long as you pick the components correctly you can do much higher wattage. The passives are pretty easy, the main thing is to pick a FET that has a low enough Rds(on) for thermal reasons and a low enough gate charge that you do not current limit VCC (Ivcc = Qg*Fsw). I have seen designs up to around 150W so it can be done. Feel free to let me know if you have any further questions.

    Regards,

    Clint